Queen Camilla holds a vital role in supporting King Charles on royal tours, according to a source.
Buckingham Palace is making long-term plans for the King to resume a full programme of international travel next year.
The news represents a major health update on the monarch.
King Charles was diagnosed with cancer earlier this year and took a short break from royal duties, however, he returned to undertaking engagements in late April this year.
Queen Camilla holds a vital role in supporting King Charles on royal tours, according to a source.
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King Charles and Queen Camilla have just completed their international tour to Australia and Samoa.
A senior palace official said: “The King gets great strength from the Queen being there, not least because she keeps it real.”
The official added that the King is thriving in undertaking engagements and meeting with the public.
They said: “A great measure of the way that the king is dealing with his [cancer] diagnosis, and he’s a great believer in mind, body and soul, and this combination works very well on a visit like this, because he feels that sense of duty so strongly.
King Charles and Queen Camilla have just completed their international tour to Australia and Samoa.
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"It’s hard to overstate the joy that he takes from duty and service and being in public and seeing those crowds engaging with communities across the spectrum.
"That really does lift his spirits. You can see that."
Yesterday, King Charles and Queen Camilla bid farewell to Samoa after carrying out a successful South Pacific tour.
During the event, the King was bestowed with an honorary title, "To'aiga-o-Tumua of the village of Siumu".
The farewell ceremony showcased the warm reception and cultural significance of the royal visit, which included stops in Australia and Samoa. This visit marked the first time the couple had travelled to the island nation.
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King Charles expressed his gratitude to the Samoan people in a speech during the ceremony.
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King Charles expressed his gratitude to the Samoan people in a speech during the ceremony.
He said: "We've been so impressed by the beautiful way in which all the villages have decorated the roadsides, it is something very special about Samoa."
The monarch thanked residents for their "wonderful generosity" and the gifts they had received.
King Charles added: "I shall always remain devoted to this part of the world and hope that I survive long enough to come back and see you."
